How are these numbers calculated?

Big Games

How we did last week and who we should root for this week.   Explain

Week of 5/28100.0*Chance in playoffs100.0*Average seed
Tonga 6 Canada 24 -16.7
-0.6
Tonga 35 Uruguay 20 +0.7
+0.5
Japan 15 Canada 39 -0.5
Japan 40 Uruguay 20 -0.2
-0.0
Week of 6/5100.0*Chance in playoffs100.0*Average seed
Canada 36 Uruguay 15 No
Japan 43 Tonga 22 No
-0.5
Games Above .500
Chance Will Make Playoffs